Control of polarization and mode mapping of small volume high Q micropillars

Abstract

ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractWe show that the polarization of the emission of a single quantum dot embedded within a microcavity pillar of elliptical cross section can be completely controlled and even switched between two orthogonal linear polarizations by changing the coupling of the dot emission with the polarized photonic modes. We also measure the spatial profile of the emission of a series of pillars with different ellipticities and show that the results can be well described by simple theoretical modeling of the modes of an infinite length elliptical cylinder.

Emission polarization control in semiconductor quantum dots coupled to a photonic crystal microcavity

“…Continuous control of the linearly polarized emission of QDs is desirable to obtain variable polarization SPEs and controlled sources of entangled photon pairs [6,7]. The polarization of the photons emitted by a single QD is known to be influenced by its coupling to an optical micro-cavity mode (CM) [8,9]. In QDs embedded in a micropillar cavity with elliptical cross section [8] the polarization of the light emitted at the QD energy becomes parallel to that of the CM closest in energy.…”

Optical properties of wide‐bandgap monolithic pillar microcavities with different geometries

“…[15]). Transmission electron microscopy (TEM) investigations on a reference sample reveal a QD density of 5×10 10 cm −2 and QD diameters of about 5 nm [16].…”

“…This may be achieved by altering the shape of the micropillars, leading to a control of the photonic mode structure to some extent [8]. With this technique a polarized QD emission could be shown for elliptically shaped MCs in the III-V material system [9,10]. Furthermore, the coupling of different QDs is of high interest for the generation of entangled photons which can be achieved via the electromagnetic field in a cavity [11] as well as by the coupling of several pillar MCs to increase the efficiency by the use of a photonic molecule (PM) [12].…”

Properties and prospects of blue–green emitting II–VI‐based monolithic microcavities

“…A lifting of the polarization degeneracy of the modes was already demonstrated for pillars with an elliptical cross section [35,[139][140][141][142] for GaAs-based MCs. For circularly shaped MCs with an unintended very small ellipticity this energy splitting increased with decreasing pillar diameter [143].…”